macOS 15 Sequoia has released, and although it seems the latest version of Mitti and Vezér runs fine on it*, there is no reason to rush upgrading primary systems until Apple releases at least the first dot release.
*Edit: Quicklook plugins don’t working in Mitti 2.8.4 and Vezér 1.9.6 so there’s no way to Quicklook project files in Finder yet.
Unfortunately we weren’t able to test every possible hardware and software combinations, so if you are running into any issues, please don't hesitate to contact us!